Ruby Array permutation()用法及代码示例

Array＃permutation()：permutation()是一个Array类方法，该方法返回数组元素长度n的所有排列，然后返回数组本身。

用法：Array.permutation()

参数：数组

返回：数组元素长度为n的所有排列，然后返回数组本身。

示例1:

# Ruby code for permutation() method 
  
# declaring array 
a = [18, 22, 33, nil, 5, 6] 
  
# declaring array 
b = [1, 4, 1, 1, 88, 9] 
  
# declaring array 
c = [] 
  
# permutation method example 
puts "permutation() method form : #{a.permutation(2).to_a}\n\n"
  
puts "permutation() method form : #{b.permutation(1).to_a}\n\n"
  
puts "permutation() method form : #{c.permutation(4).to_a}\n\n"

输出：

permutation() method form : [[18, 22], [18, 33], [18, nil], [18, 5], [18, 6], [22, 18], [22, 33], [22, nil], [22, 5], [22, 6], [33, 18], [33, 22], [33, nil], [33, 5], [33, 6], [nil, 18], [nil, 22], [nil, 33], [nil, 5], [nil, 6], [5, 18], [5, 22], [5, 33], [5, nil], [5, 6], [6, 18], [6, 22], [6, 33], [6, nil], [6, 5]]

permutation() method form : [[1], [4], [1], [1], [88], [9]]

permutation() method form : []

示例2:

# Ruby code for permutation() method 
  
# declaring array 
a = ["abc", "nil", "dog"] 
  
# declaring array 
c = [nil] 
  
# declaring array 
b = ["cow", nil, "dog"] 
  
# permutation method example 
puts "permutation() method form : #{a.permutation(2).to_a}\n\n"
  
puts "permutation() method form : #{b.permutation(1).to_a}\n\n"
  
puts "permutation() method form : #{c.permutation(4).to_a}\n\n"

输出：

permutation() method form : [["abc", "nil"], ["abc", "dog"], ["nil", "abc"], ["nil", "dog"], ["dog", "abc"], ["dog", "nil"]]

permutation() method form : [["cow"], [nil], ["dog"]]

permutation() method form : []

相关用法

注：本文由纯净天空筛选整理自mayank5326大神的英文原创作品 Ruby | Array permutation() function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。